# CVE-2026-48495: TypeBot Google Sheets OAuth callback can create credentials in unauthorized workspaces and modify arbitrary typebots

> An authenticated attacker can manipulate OAuth state parameters to create credentials in unauthorized workspaces and modify arbitrary Typebots.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** GHSA-w789-9gxq-2xcj

## What is CVE-2026-48495?

CVE-2026-48495 is a high-severity missing authorization vulnerability in baptisteArno typebot.io, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

TypeBot is a chatbot builder tool. Prior to version 3.17.0, the Google Sheets OAuth callback decodes a base64-encoded JSON `state` parameter and trusts the embedded `workspaceId`, `typebotId`, `blockId`, and `redirectUrl` without cryptographic integrity protection or authorization checks. The callback route is authenticated, but it does not verify that the authenticated user has write access to the target workspace or Typebot before creating credentials in the workspace or updating Typebot groups. An authenticated user who can obtain a valid Google OAuth `code` can alter the `state` value to create Google Sheets credentials in another workspace and, if target IDs are known, attach those credentials to a block in another Typebot. Version 3.17.0 patches the issue.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-48495?


## How do I fix CVE-2026-48495?

No fix has been published for CVE-2026-48495 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48495 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48495 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48495 and fix it if it is affected.

What it is: CVE-2026-48495 is a high-severity missing authorization vulnerability in baptisteArno typebot.io, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48495 exists.

Affected product: baptisteArno typebot.io. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-48495/ (Markdown: https://insights.sbomify.com/CVE-2026-48495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48495
- OSV: https://osv.dev/vulnerability/CVE-2026-48495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48495/
Summaries are generated and may contain mistakes; the official description above is the record.